Corrected entry: The British Petroleum Deepwater Horizon accident was erroneously characterized by environmental activists, by some U.S. politicians, by the press and by this film as the "worst" manmade oil spill in history. It was not. The Pemex Ixtoc 1 disaster off the Yucatan peninsula in 1979 was far worse, lasted much longer, and received almost zero press in the United States, even though it impacted virtually every coastline in the Gulf of Mexico for over a year. The Deepwater Horizon spill was hyped far above and beyond its comparatively minor environmental impact for purely political reasons (i.e., it was used to fuel opposition to offshore drilling).
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Correction: It's hard to analyze "worst oil spill" because there's so many factors involved beyond how long it lasted, including death and injuries that occurred. However, the 1979 event resulted in 140 million gallons spilt and the Deepwater Horizon spilt an estimated 206 million gallons and resulted in 11 deaths.
Bishop73
The Ixtoc 1 is still considered the worst accidental oil spill in history. Ixtoc 1 remained uncapped and freely flowing for 9 months, releasing over 3.5 Million barrels of oil into the Gulf of Mexico. That's barrels, not gallons. The only larger spill was in Kuwait, when Iraqi forces deliberately destroyed oil wells in that country, releasing 8 Million barrels of oil into the Persian Gulf. However, Kuwait is considered an "intentional" oil spill, not accidental.
Charles Austin Miller
Ixtoc 1 is only considered one of the worst spills, but not the number 1 worst spill. Deepwater Horizon released 4.9 Million Barrels (which is 40% more oil) and resulted in 11 deaths. Yes, Ixtoc 1 took 9 months to cap where Deepwater Horizon took only 5 months to cap, but the amount split was still less than Deepwater Horizon.
Bishop73
But Ixtoc was not a deep well, and its spillage was carried across the entire surface of the Gulf of Mexico for 9 months. The Deepwater Horizon was an extremely deep well, and much of its spillage remained in vast pools on the ocean floor, where it gradually degraded (yes, under extreme pressure and low temperature, crude oil will sink rather than rise to the surface). That fact also makes it impossible to estimate the total spillage of Deepwater Horizon. Nonetheless, some Deepwater Horizon spillage did rise to the surface, but not even nearly as much as the Ixtoc 1. Deepwater Horizon's environmental impact was negligible compared to Ixtoc 1; but, as stated in the original post, Deepwater Horizon was hyped and sensationalized in the press for political purposes.
Charles Austin Miller